Air heater



Jan. 24', 1939.

J. SCHMI D AIR HEATER Filed Jun 22, 1957 2 Sheets-Sheet l INVENTORATTORNEY J. SCHMID AIR HEATER Jan. 24, 1939.

Filed June 22, 1937 2 Sheets-Sheet 2 ATTORNEY Patented Jan. 24, 1939UNITED STATES PATENT OFFICE 4 Claims.

This invention relates to an air heater which will be safe fromexplosion, gases and fire, and has for the primary object the provisionof an efficient and inexpensive device of this character which will havea wide range of uses, requiring a minimum amount of space forinstallation, and which will discharge a maximum amount of heated airand distribute the latter efiiciently over a large area and may beeconomically operated due to its low consumption of fuel.

With these and other objects in view, this invention consists in certainnovel features of construction, combination and arrangement of parts tobe hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had tothe following description and accompanying drawings, in which Figure 1is a top plan view partly in section illustrating an air heaterconstructed in accordance with my invention.

Figure 2 is a vertical sectional view illustrating the same.

Figure 3 is a transverse sectional view taken on the line 33 of Figure1.

Figure 4 is a transverse sectional view taken on the line 44 of Figure1.

Figure 5 is a detail sectional view taken on the line 55 of Figure 2.

Figure 6 is a side elevation, partly in section, illustrating one of theheating tubes.

Figure '7 is a fragmentary vertical sectional view illustrating anelectrical heating element adaptable to the heating tube.

Figure 8 is a plan view illustrating a modified form of heating tube.

Figure 9 is a plan view illustrating another modified form of heatingtube.

Referring in detail to the drawings, the numeral 1 indicates anelongated casing in which are located partitions 2 dividing said casinginto a heat chamber 3 and combustion chambers 4 and 5. Said partitionshave openings to receive heating tubes 5 which extend substantially thefull length of the heating chamber 3 and all enter the combustionchamber 4 while certain of said tubes extend into the combustion chamber5. Supporting rods 1 are located at one end of the casing and areengaged by hook-shaped elements 8 of the tubes. Said end of the casinghas connected thereto a fan housing 9 open to the atmosphere and inwhich operates a power driven fan Ill. Between the open end of the fanhousing and the fan I is a screen H for collecting the foreign matterfrom the air drawn in by the fan and expelled through the heat chamberabout the tubes, the latter having spiral ribs I2 formed thereon tocause a swirling movement to the air driven through the heat chamber 3.A discharge pipe I3 is connected with the heat chamber 3 and includes acurved portion terminating in a flared dischargemember l 4 locatedlaterally of the housing or casing! and in a plane thereabove.Deflecting plates I are located in the pipe l3 to cooperate with theflared member l4 in distributing the heated air over a large area.

The tubes 6 are filled with a liquid or solution, preferably of waterand glycerine or any other fluid suitable for the purpose. The casinghas doors l6 to give access to the combustion chambers in which arelocated gas burners ll. The casing above the combustion chambers isprovided with a neck l8 to which a suitable exhaust flue may beconnected. Should it not be desired to employ gas as a heating medium,electrical heating units I9 may be adapted to the tube within thecombustion chambers. When the device needs less heat for its successfuloperation, the burner in the compartment 4 may be extinguished. The heatthen being conveyed to the heat chamber .by the tubes which extend intothe chamber 5 and heated by the burner therein.

A partition 20 is located in the heat chamber 3 and extends into thepipe l3 and is located adjacent one of the partitions 2 to form acompartment in which sand may be located to act as heat resistingpacking about the tubes where the latter pass through one of thepartitions 2. The portion of the partition extending into the pipe I3acts as a deflector to deflect the hot air upwardly and towards one ofthe walls of the pipe in which is located an opening to receive thedischarge neck 2| of an air moistener 22. The air moistener is in theform of a reservoir supported in the casing I and is supplied withliquid by a supply pipe 23 equipped with a float controlled valve 24acting to maintain the liquid at a predetermined level within the airmoistener. The hot air passing through the pipe and passing thedischarge neck 2| will draw into the pipe moisture, thereby moisteningthe heated air prior to escaping from the pipe.

The tubes instead of being straight, as shown in Figure 2, may be ofcoiled formation, as shown in Figure 8, and indicated by the character25 or the tubes may be of a shape shown in Figure 9 and indicated by thecharacter 26.

What is claimed is:

1. An air heater comprising a casing including a heat chamber andcombustion chambers, heating tubes extending substantially the fulllength of the heat chamber and certain of said tubes extending throughboth of said combustion chambers and the other tubes terminating withinone of the combustion chambers, heating means in said combustionchambers for heating the tubes, an exhaust conduit connected with saidheat chamber, and means for forcing air to the heat chamber andtherefrom by way of said conduit.

2. An air heater comprising a casing including a heat chamber andcombustion chambers, heating tubes extending substantially the fulllength of the heat chamber and certain of said tubes extending throughboth of said combustion chambers and the other tubes terminating withinone of the combustion chambers, heating means in said combustionchambers for heating the tubes, an exhaust conduit connected with saidheat chamber, a fan casing connected on on said casing and communicatingwith the heat chamber, a power driven fan operating in the fan casing.

3. An air heater comprising a casing including a heat chamber andcombustion chambers, heating tubes extending substantially the fulllength of the heat chamber and certain of said tubes extending throughboth ,of said combustion chambers and the other tubes terminating withinone 'of the combustion chambers, heating means in said combustionchambers for heating the tubes, an exhaust conduit connected with saidheat chamber, a fan casing connected on said casing and communicatingwith the heat chamber, a power driven fan operating in the fan casing,said heat chamber having a compartment located adjacent the combustionchambers and filled with a pulverized material, said tubes containing: aliquid.

4. An air heater comprising a casing including a heat chamber andcombustion chambers, heating tubes extending substantially the fulllength of the heat chamber and certain of said tubes extending throughboth of said combustion chambers and the other tubes terminating withinone of the combustion chambers, heating means in said combustionchambers for heating the tubes, an exhaust conduit connected with saidheat chamber, a fan casing connected on said casing and communicatingwith the heat chamber, a power driven fan operating in the fan casing,said heat chamber having a compartment located adjacent the combustionchambers and filled with a pulverized material, said tubes containing aliquid, and spiral ribs formed on said tubes.

JOSEPH SCI-IMID.

